/Engine/Source/Editor/UnrealEd/Public/Kismet2/BlueprintEditorUtils.h
Add a new interface, and member function graphs to the blueprint
static bool ImplementNewInterface ( [UBlueprint](API\Runtime\Engine\Engine\UBlueprint) * Blueprint, [FTopLevelAssetPath](API\Runtime\CoreUObject\UObject\FTopLevelAssetPath) InterfaceClassPathName )